câu b là:

=37.(24+76)+63.(79+21)

=37.100+63.100

=100.(37+63)

=100.100

=10000

1 + 2 + 3 + 4 + ..... + 49 + 50(có 50 số hạng)

=51 × 25 = 1275

2 . 17 . 12 + 4 . 6 . 21 + 8 . 3 . 62

= 24 . 17 + 24 . 21 + 24 . 62

= 24 . ( 17 + 21 + 62 )

= 24 . 100 = 2400

37 . 24 + 37 . 76 + 63 . 79 + 63 . 21

= 37 . (24 + 76) + 63 . (79 + 21)

= 37 . 100 + 63 . 100

= (37 + 63 ) . 100

= 100 . 100 = 10000

2020 . 43 + 2020 . 56 + 2020

= 2020 . 43 + 2020 . 56 + 2020 . 1

= 2020 . ( 43 + 56 + 1 )

= 2020  . 100 = 202000

=37.(24+76)+63.(79+21)

=37.100+63.100

=100.(37+63)

=100.100

=10000

37.24+37.76+63.79+63.21

=37.(24+76)+63.(79+21)

=37.100+63.100

=100.(37+63)

=100.100

=10000

a)\(37.24+37.76+63.79+63.21=37.\left(24+76\right)+63.\left(79+21\right)\)

\(=37.100+63.100\)

\(=\left(37+63\right).100\)

\(=100.100\)

\(=10000\)

b)\(27.\left(13+48\right)+27.\left(22+17\right)=27.\left(13+48+22+17\right)\)

\(=27.100\)

\(=2700\)

Woa,cảm ựn bạn nha,may quá mk làm đúng rồi

hình như sai đầu bài đúng k bạn

37 . 24 + 37 . 76 + 6. 79 + 63 . 21 

= 37 ( 24 + 76 ) + 6 . 79 + 63 . 21 

= 37 . 100 + 6 . 79 + 63 . 21 

 = 3700 + 474 + 84

=4258

tk mk nha

37.24+37.76+68.79+63.21=10395

Sửa đề + Lời giải :

\(37.24+37.76+63.79+63.21\)

\(=37.\left(24+76\right)+63.\left(79+21\right)\)

\(=37.100+63.100\)

\(=3700+6300\)

\(=100000\)

Sửa đề

a) 37.24 + 37.76 + 63.79 + 21.63

= 37.(24 + 76) + 63.(79 + 21)

= 37.100 + 63.100

= 100.(37 + 63)

= 100.100

= 10000

b) 49 + (139 - 172 + 99) - (139 + 199 - 172)

= 49 + 139 - 172 + 99 - 139 - 199 + 172

= 49 + (139 - 139) + (172 - 172) + (99 - 199)

= 49 + 0 + 0 - 100

= -51

a,17.85+15+17-120

= 17 . (85 + 15) - 120

= 1700 - 120 

= 1580

b,37.24+37.76+63.79+21.63

=37.(24+76)+63.(79+21)

=37.100+63.100

=100.(37+63)

=100.100 =10000